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物理 高中

18題,感謝

10. [2D and 3D motion] Show that the potential energy U(r) ofFa particle of nass jat aa distance r(> 員 from a planet of Inass 4 and radins 戶話 11. [The cross product] Caleulate the cross product A x B, assuming that A and B both lie in the x-y plane and have the respective nonzero components 4,, 4, and 妖,, 且, 12. [Angular momentum] Show that 主r, the instantaneous position ofa particle of mass mu with respect to a certain origin O, is parallel to its acceleration dv/吧, then the time Tate of change of the angular Inoimentum L with respect to the given origin vanishes 13. [Theorem 了 Show that the torque-angular momentum formnla _箇 7二 is also valid for a two-particle system 放 the origin lies at the center of mass 14. [Theorem IIH] Two particles of respective Inass ml and 2 are connected to the ends of amassless rod and Inove in the uniform gravitational field g ofthe earth. (a) What is the acceleration of their center of nass Telative to a Newtonian origin O? (b) Show that the angular Inomentum of the two particles about their center of nass 生 aconstant of the motion. 15. [Moments of inertia] Calculate the moment of inertia ofathin, uniform rod of mass m and length / about an axis perpendicular to the rod and at a distance q from one end. 16. [Rotation about a fixed axis] Consider the rotating cylinder in Figure, and suppose that A7 sg, Fo 三 0.6 Nt, and @ 二 0.2m, Calculate (a) The torque 7 acting on the cylinder (b) Ti ngular aceeleration q of the cylinder 17. [Work and kinet: instant Totat eenergy] A 40-kg homogeneous sphere of radius 10 cm is at acertain about ashaft through its center at 600 rpm. Assuining that a constant fric itude ets so that the sphere comes to rest in 10 seconds, Calculate th tional torque ofthis torque. 18. [The physical pendl end and allowed to oscillate freely in a horizontal plane (see Figure) m] A uniform Tod of Inass ru and length / is suspended at one (a) What is the period of this physic lpendulum for small amplitudes? (b) Ithe velocity u0 of the mass ce Hulum is initially released at rest in a horizontal position。what is the er at a subsequent instant when the Tod is vertical? (ec) Calculate the vertical and the horizontal components of the force on the rod at the point of suspensic 19 and rotations] Analyze the motion of a homogeneous sphere of mass 和7 and Tadius dq, which rolls without slipping down a fixed inclined plane of angle # 20. of angular momentum] A Inan has ainoment of inertia 五 about the = axis. He is originally at Test and standing on asinall platform which can turn freely. Ifhe is handed a wheel which is rotating at and has anoinent of inertia 了about its spinning axis, determine his angular velocity 放 (a) he holds the wheel upright, (b) turns the wheel out 9 二 90?, and (c) turns the wheel downward, 9 二 180?. Neglect the effect of holding the wheel a distance d away from the z axis

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物理 高中

求解第六題答案是D

FaGood luck to youll 1 如圖所示,以手輕 II 面上的O點。現 鉛直地豎立在水平揚 | 由地向右方倒下來 和 筆從靜止開始自 | 止在虧面上給玉語思 '且筆桿均勻,則最後鉛筆靜 則 企果面上的形狀最可能為下列何者 ? 94 大方中心】 和 zoo (AA) GB ) 加 (C 計 2一一 主 人 Zoo zzz zzz 0D) (E zoZ 六 讓 和 十 一 2 參 人 說讓 屆 了 ~ 靜止於光滑水平面上的台車質量30 公斤,長度4公尺。一人質量 60 公斤原靜立在 信誡 以 人 台車距左端 0.5 公尺處,當他走到台車中央時,台車移動了。(A)1.2 (B)1.0 (C)09 (D)0.6 (E)0.5 公丸。I89 高克】 3. 如右圖,在阿特午機上懸質量 mi及 m2 之二物,滑輪及繩之質量與摩擦 等均不予考慮,由靜止開始運動後 (mi>>m2) 。求質心的加速度大小為 何? If99前中 區] 4 AL Z4.。 自水平地面作斜拋運動之物體,在最高點之動量量值恰為拋出時的 5 '此時突然分 裂為質量相等之兩塊,其中一塊以初速為零落下,則此裂塊落地時的動量量值與原 全4 說 拋出時物體動量量值之比值為(A)< (B)0(COS(D)1(E) 。 U/5.。 一質量為 4m 的 A 粒子以速率 V 運動時,分裂成為一個質量為m 的 B 粒子和一個 質量為3m 的C 粒子。已知B 粒子的速率為3V,運動方向垂直於原來 人粒子的行 進方向‧試問C 粒子的速率為何? 【90 大為中心】 6.一個質點自水平地面朝右上方疼向拋射,在最高點時,突然爆裂為 質量相等的甲、乙兩質點。如圖(4)所示。爆裂之後,甲循原路徑落 回到原拋射點。若忽賂空氣胃力,爆裂位置與原拋射點的水平距離 R,則當乙落地時,與原拋射點的水平距離為: (A)R (B)2R (C3R (D)4R (E)5R 7. 質量為 1.0 公斤的A 球,以4.0m/s 的速率撞及靜止的 B 球,相撞後 A 人 全 球以3.0 公尺/秒速率與原來入射方向成 90 方向運動,B 球被撞後速_G@~伺 率為125mA 如圖所示,則碰撞後系統的質心速度的量值為多少ms? veuaek 8. 一質量為55 公斤的人,手持5.0 公斤的球,乘坐在一質量為 20 公斤的車子上,車子 在下 光湯的軌道上以 2.0 公尺/秒的速度前進。 如將球沿車行的反方向水平拋出,球拋出的關 間相對於人的速度為8.0 公尺/秒,則球拋出後車子對地的速度為多少公尺/秒? 六 9. 一傾角為37" 質量為 M 之斜面靜置於光滑水平地面,另一質量為mtm~ )的 質點 該斜面頂端自由滑下,斜面高為h,若不計一切阻力,則當質點滑至斜面底端時,永(1) 面位移 及(2)系統(質點與斜面)質心位移之量值各為若十? 多芝點導勤 P1

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